Yolk-Sac-Fry Mortality (M74) In Baltic Sea Salmon (Salmo Salar L.): Analyses Of Its Relation To The Diet ...
No abstracts are to be cited without prior reference to the author.In recent years, Baltic Sea salmon (Salmo salar) have suffered reproduction difficulties, due to high mortality during the larval phase (the M74 disease). Analyses oflong term mortality records (1928-98) from two salmon hatcheries in...
| Main Authors: | , , , , , , , |
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| Format: | Conference Object |
| Language: | unknown |
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ASC 1999 - U - Theme session
2024
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| Online Access: | https://dx.doi.org/10.17895/ices.pub.25637517.v1 https://ices-library.figshare.com/articles/conference_contribution/Yolk-Sac-Fry_Mortality_M74_In_Baltic_Sea_Salmon_Salmo_Salar_L_Analyses_Of_Its_Relation_To_The_Diet/25637517/1 |
| Summary: | No abstracts are to be cited without prior reference to the author.In recent years, Baltic Sea salmon (Salmo salar) have suffered reproduction difficulties, due to high mortality during the larval phase (the M74 disease). Analyses oflong term mortality records (1928-98) from two salmon hatcheries indicate that M74 did not occur or was infrequent before the 1970s. The disease can be cured by thiamine treatment and this indicates that the mortality results from a thiamine deficiency. The frequency of M74 is strongly correlated to the abundance of sprat (Sprattus sprattus (L.)) and it has been suggested that M74 results from changes in the food web. To study the possible role of diet changes in relation to M74, we have compared stomach content in salmon collected 1959-62 and 1994-97. Sprat, herring (Clupea harengus L.) and threespined stickleback (Gasterosteus aculeatus L.) dominated the diet in both periods. The average size of consumed sprat and herring was significant smaller in the 1994-97 compared to ... |
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